Geochemistry of the Bagnères-de-Bigorre thermal waters from the North Pyrenean Zone (France)

Thermal springs are poorly known in the sedimentary sites of the Pyrenees. In this paper, we describe the ‘Bagnères‐de‐Bigorre’ springs which occur in a remarkably active seismotectonic context. A chemical and isotopic study of 15 spring waters (both cold and thermal, ranging in temperature from 7.0 to 49.9°C), and continuous monitoring of a single spring allow us to characterise water–rock interactions, fluids paths and mixing processes. Three groups of waters are distinguished: (I) SO₄²⁺–Ca²⁺–Cl^– thermal waters (II) SO₄²⁺–Cl^––Ca²⁺ thermal waters and (III) HCO₃^––Ca²⁺ cold shallow waters. Their characteristics suggest interactions with Mesozoic evaporite and carbonate formations. O and D isotopes from thermal waters indicate a local meteoric origin of Atlantic signature and a recharge elevation of 800 to 1000 m, which corresponds to a single feeding area. Their δ¹³C values (?2.8 to ?9.6‰) are consistent with carbonate dissolution, slight fractionation and a surficial organic input leading to δ¹³C depletion. Sr isotopes (0.70751 to 0.70777), Na⁺/Cl^– and (Ca²⁺ + Mg²⁺)/SO₄^2– ratios as well as thermodynamic calculations show that the dissolution of anhydrite and halite‐bearing Triassic layers control the chemical composition of group‐I and ‐II waters. The contrasting trends of cation/Cl^– ratios and TDS of waters from groups I and II suggest the existence of two different circulation paths at depth as well as dilution with surficial waters similar to group III. Calculated mixing proportions show that three waters from group I are diluted from 17 to 66%, whereas all waters from group II are mixed. The aquifer temperature is estimated to be in the range 55–64°C using the retrograde and prograde solubilities of anhydrite and chalcedony, respectively. Accordingly, the mean depth of the reservoir is around 1.7 km, which allows us to constrain the depth of the Triassic layer.     

Informal heritage-making at the Sarawak Cultural Village,East Malaysia

ABSTRACT

Scholars have always been fascinated with cultural theme parks as tourism attractions or as vehicles for identity formations. With respect to the latter, the focus has been on how these consumption landscapes also portend spaces of representation that mobilize certain attributes of ethnic groups within territorial boundaries as a means to bind them together and link them to their terrains, although these ideological exercises are often times contested by the very people they seek to depict. Yet, comparably less emphasis has been paid on how local visitors can themselves draw upon their own cultural reserves to rethink the meanings of these spaces to make them more relatable. Drawing on participant ethnography and interviews with key staff and visitors, this paper examines how locals have sought to unmake and remake one such theme park, the Sarawak Cultural Village, to enhance resonance for them and for other visitors, at times even going against intended narratives. In so doing, the paper extends current scholarship beyond seeing themed spaces just as places where the formal employment of heritage for identity-building may be contested; they are also where meanings can be (re)negotiated ‘from below’, proffering more possibilities for co-constructive heritage-making.     

The dilemmas of ontological insecurity in a postcolonising Northern Ireland

ABSTRACT

Since the signing of the Belfast Good Friday Agreement of 1998, Northern Ireland has made significant progress towards a postcolonising transformation of its political culture and its major political and social institutions, as it has shifted away from violence and the dominance of political ideologies structured by the friend–enemy distinction. These ideological formations and the practices of social and political antagonism that they prescribed have been challenged by adversary–neighbour ideological formations that construct identities and relations through more inclusive norms of recognition and that support a more complex emotional constellation. However, as this cultural transformation has been neither thoroughgoing nor universal, Northern Ireland finds itself in the somewhat counter-intuitive situation in which the shift away from the violence of the past has increased, rather than reduced, the ontological insecurity of its citizens. Moreover, as ontological security may be supported by either friend–enemy or adversary–neighbour ideological formations, two distinct ways in which ontological security may collapse or re-configure have emerged in Northern Ireland.     

Assessment of Relationships Between Precipitation and Satellite Derived Vegetation Condition Within South Australia

The normalised difference vegetation index (NDVI) has evolved as a primary tool for monitoring continental‐scale vegetation changes and interpreting the impact of short to long‐term climatic events on the biosphere. The objective of this research was to assess the nature of relationships between precipitation and vegetation condition, as measured by the satellite‐derived NDVI within South Australia. The correlation, timing and magnitude of the NDVI response to precipitation were examined for different vegetation formations within the State (forest, scrubland, shrubland, woodland and grassland). Results from this study indicate that there are strong relationships between precipitation and NDVI both spatially and temporally within South Australia. Differences in the timing of the NDVI response to precipitation were evident among the five vegetation formations. The most significant relationship between rainfall and NDVI was within the forest formation. Negative correlations between NDVI and precipitation events indicated that vegetation green‐up is a result of seasonal patterns in precipitation. Spatial patterns in the average NDVI over the study period closely resembled the boundaries of the five classified vegetation formations within South Australia. Spatial variability within the NDVI data set over the study period differed greatly between and within the vegetation formations examined depending on the location within the state. ACRONYMS AVHRR Advanced Very High Resolution Radiometer ENVSAEnvironments of South Australia EOS Terra‐Earth Observing System EVIEnhanced Vegetation Index MODIS Moderate Resolution Imaging Spectro‐radiometer MVC Maximum Value Composite NDVINormalised Difference Vegetation Index NIRNear Infra‐Red NOAANational Oceanic and Atmospheric Administration SPOT Systeme Pour l’Observation de la Terre